raftkv: add InvalidMaxTsUpdate RPC error

[nozjkoitop]

What is changed and how it works?

Issue Number: Close #18253

What's Changed:

Add a dedicated InvalidMaxTsUpdate RPC error so update_max_ts failures become real, typed errors instead of silent logs.

Related kvproto pr: pingcap/kvproto#1317

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Release note

None

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